How to call a stored procedure from a function

Hi
The idea is to generate the sequence for some of the fields in the table.
Since the identity property sets the sequence to only one of the field in
the table, decided to have a UDF that would create a new sequence value
generated for the fields.
But when the function is called i get the error
"Only functions and extended stored procedures can be executed from within a
function." Please suggest
The below table will hold the names of the fields that would require the
sequence to be generated and the last value generated updated by the stored
procedure.
CREATE table SEQ_GENERATOR_TBL
( seq_name varchar(50) not null,
last_value bigint default 0 not null);
GO
insert into SEQ_GENERATOR_TBL(seq_name)
values('SEQ_IS_GLOBAL_IDENTIFIER');
CREATE function SEQ_GENERATOR_FUNC
(@.p_seq_name varchar(50))
RETURNS bigint
AS
BEGIN
DECLARE @.ret_next_value bigint
SET @.ret_next_value = (select last_value+1 as next_value
from SEQ_GENERATOR_TBL
WHERE seq_name = @.p_seq_name);
EXEC UPD_SEQ_GENERATOR_PROC @.p_seq_name, @.ret_next_value;
RETURN @.ret_next_value;
END
GO
CREATE PROCEDURE UPD_SEQ_GENERATOR_PROC
@.p_seq_name varchar(50),
@.p_curr_value bigint
AS
BEGIN
BEGIN TRANSACTION;
UPDATE SEQ_GENERATOR_TBL SET last_value = @.p_curr_value
WHERE seq_name = @.p_seq_name;
COMMIT TRANSACTION;
RETURN;
END
GOJP
Do you expect the same sequence as the IDENTITY property is set to? Have you
considered using computed column?
"JP" <JP@.discussions.microsoft.com> wrote in message
news:CD9841BA-3ED6-4140-BC3D-3588FC522226@.microsoft.com...
> Hi
> The idea is to generate the sequence for some of the fields in the table.
> Since the identity property sets the sequence to only one of the field in
> the table, decided to have a UDF that would create a new sequence value
> generated for the fields.
> But when the function is called i get the error
> "Only functions and extended stored procedures can be executed from within
> a
> function." Please suggest
> The below table will hold the names of the fields that would require the
> sequence to be generated and the last value generated updated by the
> stored
> procedure.
> CREATE table SEQ_GENERATOR_TBL
> ( seq_name varchar(50) not null,
> last_value bigint default 0 not null);
> GO
> insert into SEQ_GENERATOR_TBL(seq_name)
> values('SEQ_IS_GLOBAL_IDENTIFIER');
> CREATE function SEQ_GENERATOR_FUNC
> (@.p_seq_name varchar(50))
> RETURNS bigint
> AS
> BEGIN
> DECLARE @.ret_next_value bigint
> SET @.ret_next_value = (select last_value+1 as next_value
> from SEQ_GENERATOR_TBL
> WHERE seq_name = @.p_seq_name);
> EXEC UPD_SEQ_GENERATOR_PROC @.p_seq_name, @.ret_next_value;
> RETURN @.ret_next_value;
> END
> GO
> CREATE PROCEDURE UPD_SEQ_GENERATOR_PROC
> @.p_seq_name varchar(50),
> @.p_curr_value bigint
> AS
> BEGIN
> BEGIN TRANSACTION;
> UPDATE SEQ_GENERATOR_TBL SET last_value = @.p_curr_value
> WHERE seq_name = @.p_seq_name;
> COMMIT TRANSACTION;
> RETURN;
> END
> GO
>|||Where do you want to show the data?
If you use reports do the numbering there
Madhivanan|||JP (JP@.discussions.microsoft.com) writes:
> The idea is to generate the sequence for some of the fields in the table.
> Since the identity property sets the sequence to only one of the field in
> the table, decided to have a UDF that would create a new sequence value
> generated for the fields.
> But when the function is called i get the error
> "Only functions and extended stored procedures can be executed from
> within a function." Please suggest
Rework and redesign. A function must not change database state, why
updates are not permitted, and neither calls to stored procedure as
they could do about anything.
Itzik Ben-Gan discussed a couple of solution in his column T-SQL Black
Belt in SQL Server Magazine a couple of issues back.
Erland Sommarskog, SQL Server MVP, esquel@.sommarskog.se
Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/pr...oads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodin...ions/books.mspx